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https://issues.apache.org/jira/browse/ZOOKEEPER-856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Han updated ZOOKEEPER-856:
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Fix Version/s: (was: 3.5.3)
3.5.4
> Connection imbalance leads to overloaded ZK instances
> -----------------------------------------------------
>
> Key: ZOOKEEPER-856
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-856
> Project: ZooKeeper
> Issue Type: Bug
> Reporter: Travis Crawford
> Assignee: Mahadev konar
> Fix For: 3.5.4, 3.6.0
>
> Attachments: zk_open_file_descriptor_count_members.gif,
> zk_open_file_descriptor_count_total.gif
>
>
> We've experienced a number of issues lately where "ruok" requests would take
> upwards of 10 seconds to return, and ZooKeeper instances were extremely
> sluggish. The sluggish instance requires a restart to make it responsive
> again.
> I believe the issue is connections are very imbalanced, leading to certain
> instances having many thousands of connections, while other instances are
> largely idle.
> A potential solution is periodically disconnecting/reconnecting to balance
> connections over time; this seems fine because sessions should not be
> affected, and therefore ephemaral nodes and watches should not be affected.
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